The sedimentary evolution of the studied area and its related areas has been analyzed via the seismic analysis, gravity, magnetic data and the latest research based on the provenance, including the characteristics of the deeply large faults, the major tectonic events of the Late Triassic and the distribution of strata around the Helan Moutains. The formation of deep faults in the studied area has been influenced by multi-phased interaction after the later period. The main characteristics of studied sediment in different epochs has been depicted here, involving the changes presented in the early and the end of the Late Triassic. The sag rift formed from the Early Paleozoic and the extended basin produced in the stable basin from the Late Paleozoic suggests that the main basin in Helan Moutains formed by the largely extensional depression which has been interacted among the blocks from the Late Triassic. The whole fault system is characterized by the ‘Mantle Mode’ which performs a shuttle-like shape. The structure of the western Taerling-Baijijigou fault shows the most flexibility which is also with the longest depression distance. The Taerling-Baijijigou fault is shaped like a large curve which extends to the west of Zhengyiguan falut in the northeast direction and extends to the Tanjinggou area in the south direction, reducing gradually to the ends. The co-occurred Rujigou-Xiangbangzigou fault presents a shallow extension of the mainly deep depression which is fused by the west of Dashuigou-Guitougou fault and a present unnamed fault at the bottom of Yichuan mantle.